单项选择题

A.25mg/d开始,逐渐增至1~2mg·kg-1·d-1
B.25mg/d开始,逐渐增至2~4mg·kg-1·d-1
C.50mg/d开始,逐渐增至1~2mg·kg-1·d-1
D.50mg/d开始,逐渐增至2~4mg·kg-1·d-1
E.100mg/d开始,逐渐增至2~4mg·kg-1·d-1